http://news.yahoo.com/s/ap/20090528/...eas_nuclear_92
SKorea, US troops on alert after North's threats
By ERIC TALMADGE, Associated Press Writer Eric Talmadge, Associated Press Writer
30 mins ago
SEOUL, South Korea – South Korean and U.S. troops raised their alert Thursday to the highest level since 2006 after North Korea renounced its truce with the allied forces and threatened to strike any ships trying to intercept its vessels.
The move was a sign of heightened tensions on the peninsula following the North's underground nuclear test and its firing of a series of short-range missiles earlier this week.
In response, Seoul decided to join more than 90 nations that have agreed to stop and inspect vessels suspected of transporting banned weapons.
North Korea says South Korea's participation in the U.S.-led Proliferation Security Initiative is a prelude to a naval blockade and raises the prospect of a naval skirmish in its western waters.
On Wednesday, it renounced the 1953 truce that halted fighting in the Korean War. It said Thursday through its official media that it was preparing for an American-led attack. The U.S. has repeatedly denied it is planning military action.